The Plants vs. Zombies sequel isn't ready for release yet, but PopCap is offering the original game for free on iOS devices. This offer is only available for a limited time, so make sure you have downloaded the game before February 28th. If you haven't played Plants vs. Zombies since it was originally released, here are details on updates from the latest version:

"Greetings zombie fighters. The zombies have invaded en masse and the fiends have denied you the use of sunflowers! Can you battle through 4 levels of zombie hordes using a limited amount of sun and prevail in a desperate last stand? Should you succeed, an even tougher challenge awaits you with Last Stand Endless. Grab the new Hammer Time, Still Standing and Stuff of Legends achievements while you’re at it. And try out some powerful new mallets to give those pesky Gargantuars a good whacking!

MAKE YOUR STAND: The Last Stand Game Pack features 5 new levels plus Endless.

ACHIEVE GREATNESS: Unlock 3 new achievements: Hammer Time, Still Standing and The Stuff of Legends.

AS SMART AS A BAG OF HAMMERS: Pick up a new Mallet Pack to help you whack zombies in Survival and Last Stand Endless modes.

PvZ STUFF: Check out the PvZ Store for loads of great Plants vs. Zombies goods."

To download the iPad version, visit: http://t.co/3TwmbP3l8d

To download the iPhone version, visit: http://t.co/Bv2Tkbe0r3

Source: PopCap